Why am I getting 'Error: listen EADDRINUSE' when running my Node.js server and making an XMLHttpRequest?

Troubleshooting "Error: listen EADDRINUSE" in Node.JS

When attempting to simultaneously run a server on port 80 and initiate an XMLHttpRequest, you may encounter the error "Error: listen EADDRINUSE." This issue arises when your local system attempts to allocate the same port to multiple applications, leading to a conflict.

In the provided server script:

net.createServer(function (socket) {
    socket.name = socket.remoteAddress + ":"+ socket.remotePort;
    console.log('connection request from: ' + socket.remoteAddress);
    socket.destroy();
  }).listen(options.port);

and the request:

var xhr = new XMLHttpRequest();

xhr.onreadystatechange = function() {
    sys.puts("State: " + this.readyState);

    if (this.readyState == 4) {
        sys.puts("Complete.\nBody length: " + this.responseText.length);
        sys.puts("Body:\n" + this.responseText);
    }
};

xhr.open("GET", "http://mywebsite.com");
xhr.send();

the issue lies in the server listening on port 80 while the XMLHttpRequest attempts to access the same port. To resolve the collision, you can consider using a different port for your server or for the XMLHttpRequest.

Additional troubleshooting steps:

• Ensure that no other applications are already listening on port 80.
• Restart Node.JS and your web browser.
• Check your firewall settings to make sure they are not blocking the port.
• If necessary, forcefully terminate any Node.JS processes using killall -9 node. However, note that this should be used with caution as it can also kill other system processes.

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